Draft-rigging.



PATBNTBD JAN. 6,' 190s.

W. M. PIPER. DRAFT RIGGING.

'PPLIATION FILED 00T. l0, 1902.

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PATENTE] JAN. 6, 1.903.-v

W M. PIPER DRAFT RIGGING. APPLICATION FILED 001210, 1802.

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FFICEE,

UNTTE STATES sTnNT WILLIAM M. PIPER, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR TO MARY S. CHALFANT, OF ALLEGHENY, PENNSYLVANIA.

DRAFT-RIGGlNG.

SPEGIFICATON 'forming part 0f Letters Patent No. 717,615, dated January 6, 1903. duplication iled ctoher 1G, 1902. Serial No. 126,723. (No model.)

T @ZZ whom it may concern: the inclined surfaces. The action in buiiing Be it known that I, WILLIAM M. PIPER, of will be substantially the same, the follower Allegheny, Allegheny county, Pennsylvania, moving backwardly, and thus moving the have invented a new and useful Draft-Rigwedgeblooks inwardly, while simultaneously 5 ging, of which the following is a full, clear, moving the follower 7 backwardly, thus comand exact description, reference being had to pressing the two rear springs 8. An easy acthe accompanying drawings, forming part of tion is thus adorded, the major portion of this specification, in whichwhich is borne by the springs S. In heavier Figure 1 is a top plan view, partly broken bufiing or pulling strains the springs S will be 6o Io away, showing one form of my improved compressed untilthe rear follower strikes the draft-rigging; and Fig. 2 is a similar view stems 9, after which the further movement showing a modified form of the same. will be received by the friction wedge system, My invention relates to draft-riggings in which enough resisting power is aiorded wherein springs are combined with movable to carry the strains desired. I5 friction elements, and more especially to the In Fig. 2 I show a form similar to that wedge-and-spring system; and it is designed shown in Fig. l, except that instead of allowto improve the construction of such rigging ing the springs 8 to abut at one end against and provide for more deflection than can be the'follower 7 I provide anotherifollower 17, conveniently arranged for with the wedgesimilar to the rear follower 6', which rests 7c zo and-spring system alone; also, to provide for againstside stops I8 and is pressed againsta an easier action on a lighter strain, while on stop A19, extending between the two legs of heavier strains the power will he furnished the yoke. Inasmuch as this stop 19 moves by the friction system. with the yoke, it will be evident that upon In the drawings, referring to theform of any movement of the draw-bar the spiral 25 Fig. 1, :2 2 represent the draft-timbers; 3, the springs 8" will be compressed the same disdraft-bar; 4, the yoke, and 5 5 the sideirons tance that the follower 7' or 10' is moved. In and supports for the parts of the rigging. 6 this way the action of the friction-gemis aided is a rear follower, between which and a folby the resistance of the springs S', vthus iny lower7 are placed two spiral springs 8 S, which creasing the power of the rigging as a whole, 8o 3o may be held in place by inwardly-projecting while at the same time the easy action on stems 9 on one or both of the followers. In lighter strains is provided for by allowing a the front part of the rigging is a follower 10, space between one of the followers 7' and 10' having its body similar to the follower '7, each and stops on the draft-iron. of these having on theirinner ends oppositely- When the parts are in theposition shown S 5 35inclined faces ll, which act upon the oppoin Fig. 2, it is evident that on a light pulling site ends of oppositely-movable wedge-blocks strain the springs 8 will be compressed with- 12 l2. Aspiral spring 13 is held between the out any action of the friction-gear until the wedge-blocks by stub 14, this spring norfollower l0' reaches the stops 15'. After this mally pressing the wedge-blocks outwardly amount of movement both gears act together. 9o 4o and holding them in the position shown. In Instead of the form shown the spacer in the this position the front follower 10 rests against strap may be narrower than the side stops, stops 15 on the draft-iron, and the rear folso that a gap is made between the follower lower 6 rests against similar rear stops 16. 7 and this spacing-block.

In the operation of the rigging when a light The advantages of my invention result v 45 pulling strain is brought upon the draw-bar from combining the friction-gear having the the strap ei, acting upon the rear follower 6, spring-and-wedge system with an ordinary draws it forward, and thereby compresses the spring-gear arranged in tandem therewith, springs 8, and at the same time the follower since I thereby obtainl easy action for light 7 will be forced forwardly slightly under the loads, while providing power sufficient for Ioo 5o pressure of thesestrains, moving in the wedgeheavy loads. I am also enabled to make the blocks against the action of their friction on degree of inclination of the wedge-spaces any Many variations may be made in the formv and arrangement of the spring-gears, the wedge friction-gear, and the arrangements of the parts without departing from my invention.

I claiml. In a draft-rigging, a spring resistance in combination with a friction-gear arranged in tandem therewith, the friction-gear containing a pair of blocks or followers having oppositelyinclined faces acting upon oppositely-moving wedge-blocks with a spring between them; substantially as described.

2. In a draft-rigging, a yoke with an intermediate spacing-block, a spring resistance on one side of the block and a friction -gear on the other side of the block and in tandem, said friction-gear containing a pair of blocks 

